deb-python-rcssmin/bench/main.py

#!/usr/bin/env python
# -*- coding: ascii -*-
r"""
=================================
 Benchmark jsmin implementations
=================================

Benchmark jsmin implementations.

:Copyright:

 Copyright 2011 - 2015
 Andr\xe9 Malo or his licensors, as applicable

:License:

 Licensed under the Apache License, Version 2.0 (the "License");
 you may not use this file except in compliance with the License.
 You may obtain a copy of the License at

     http://www.apache.org/licenses/LICENSE-2.0

 Unless required by applicable law or agreed to in writing, software
 distributed under the License is distributed on an "AS IS" BASIS,
 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 See the License for the specific language governing permissions and
 limitations under the License.

Usage::

    python -mbench.main [-c COUNT] [-p file] jsfile ...

    -c COUNT  number of runs per jsfile and minifier. Defaults to 10.
    -p file   File to write the benchmark results in (pickled)

"""
if __doc__:
    __doc__ = __doc__.encode('ascii').decode('unicode_escape')
__author__ = r"Andr\xe9 Malo".encode('ascii').decode('unicode_escape')
__docformat__ = "restructuredtext en"
__license__ = "Apache License, Version 2.0"
__version__ = "1.0.0"

import sys as _sys
import time as _time

import_notes = []
class jsmins(object):
    from bench import jsmin as p_01_simple_port
    if _sys.version_info >= (2, 4):
        from bench import jsmin_2_0_9 as p_02_jsmin_2_0_9
    else:
        import_notes.append(
            "jsmin_2_0_9 available for python 2.4 and later..."
        )
        print(import_notes[-1])

    import rjsmin as p_05_rjsmin
    try:
        import _rjsmin as p_06__rjsmin
    except ImportError:
        import_notes.append("_rjsmin (C-Port) not available")
        print(import_notes[-1])
jsmins.p_05_rjsmin.jsmin = jsmins.p_05_rjsmin._make_jsmin(
    python_only=True
)
print("Python Release: %s" % ".".join(map(str, _sys.version_info[:3])))
print("")


def slurp(filename):
    """ Load a file """
    fp = open(filename)
    try:
        return fp.read()
    finally:
        fp.close()


def print_(*value, **kwargs):
    """ Print stuff """
    (kwargs.get('file') or _sys.stdout).write(
        ''.join(value) + kwargs.get('end', '\n')
    )


def bench(filenames, count):
    """
    Benchmark the minifiers with given javascript samples

    :Parameters:
      `filenames` : sequence
        List of filenames

      `count` : ``int``
        Number of runs per js file and minifier

    :Exceptions:
      - `RuntimeError` : empty filenames sequence
    """
    if not filenames:
        raise RuntimeError("Missing files to benchmark")
    try:
        xrange
    except NameError:
        xrange = range
    try:
        cmp
    except NameError:
        cmp = lambda a, b: (a > b) - (a < b)

    ports = [item for item in dir(jsmins) if item.startswith('p_')]
    ports.sort()
    space = max(map(len, ports)) - 4
    ports = [(item[5:], getattr(jsmins, item).jsmin) for item in ports]
    flush = _sys.stdout.flush

    struct = []
    inputs = [(filename, slurp(filename)) for filename in filenames]
    for filename, script in inputs:
        print_("Benchmarking %r..." % filename, end=" ")
        flush()
        outputs = []
        for _, jsmin in ports:
            try:
                outputs.append(jsmin(script))
            except (SystemExit, KeyboardInterrupt):
                raise
            except:
                outputs.append(None)
        struct.append(dict(
            filename=filename,
            sizes=[
                (item is not None and len(item) or None) for item in outputs
            ],
            size=len(script),
            messages=[],
            times=[],
        ))
        print_("(%.1f KiB)" % (struct[-1]['size'] / 1024.0,))
        flush()
        times = []
        for idx, (name, jsmin) in enumerate(ports):
            if outputs[idx] is None:
                print_("  FAILED %s" % (name,))
                struct[-1]['times'].append((name, None))
            else:
                print_("  Timing %s%s... (%5.1f KiB %s)" % (
                    name,
                    " " * (space - len(name)),
                    len(outputs[idx]) / 1024.0,
                    idx == 0 and '*' or ['=', '>', '<'][
                        cmp(len(outputs[idx]), len(outputs[0]))
                    ],
                ), end=" ")
                flush()

                xcount = count
                while True:
                    counted = [None for _ in xrange(xcount)]
                    start = _time.time()
                    for _ in counted:
                        jsmin(script)
                    end = _time.time()
                    result = (end - start) * 1000
                    if result < 10: # avoid measuring within the error range
                        xcount *= 10
                        continue
                    times.append(result / xcount)
                    break

                print_("%8.2f ms" % times[-1], end=" ")
                flush()
                if len(times) <= 1:
                    print_()
                else:
                    print_("(factor: %s)" % (', '.join([
                        '%.2f' % (timed / times[-1]) for timed in times[:-1]
                    ])))
                struct[-1]['times'].append((name, times[-1]))

            flush()
        print_()

    return struct


def main(argv=None):
    """ Main """
    import getopt as _getopt
    import os as _os
    import pickle as _pickle

    if argv is None:
        argv = _sys.argv[1:]
    try:
        opts, args = _getopt.getopt(argv, "hc:p:", ["help"])
    except getopt.GetoptError:
        e = _sys.exc_info()[0](_sys.exc_info()[1])
        print >> _sys.stderr, "%s\nTry %s -mbench.main --help" % (
            e,
            _os.path.basename(_sys.executable),
        )
        _sys.exit(2)

    count, pickle = 10, None
    for key, value in opts:
        if key in ("-h", "--help"):
            print >> _sys.stderr, (
                "%s -mbench.main [-c count] [-p file] cssfile ..." % (
                    _os.path.basename(_sys.executable),
                )
            )
            _sys.exit(0)
        elif key == '-c':
            count = int(value)
        elif key == '-p':
            pickle = str(value)

    struct = bench(args, count)
    if pickle:
        fp = open(pickle, 'wb')
        try:
            fp.write(_pickle.dumps((
                ".".join(map(str, _sys.version_info[:3])),
                import_notes,
                struct,
            ), 0))
        finally:
            fp.close()


if __name__ == '__main__':
    main()